Title: Thermophysical properties of Inconel alloy 740 modified with titanium and aluminium

Authors: Daeho Kim; Woosang Jung; Sanghyun Lee

Addresses: Division of Physical Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, South Korea ' Center for Energy Materials Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, South Korea ' Division of Physical Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, South Korea

Abstract: Superalloys, which are known for their high temperature resistance, are widely used in aerospace applications, gas turbines, turbine blades for jet engines and automotive applications. The Inconel alloy 740 is a nickel-based, age-hardened superalloy, with good heat resistance and thermal stability. The thermophysical properties of the Inconel alloy 740 of varied material compositions were assessed by measurement of the thermal diffusivity, specific heat capacity, thermal conductivity, and coefficient of thermal expansion (CTE). Inconel alloy 740 was modified with titanium and aluminium. A typical IN740 alloy, ‘IN1’, had Ti (2.8 wt.%) and Al (1.4 wt.%) added, ‘IN2’ was modified using Ti (3.6 wt.%) and ‘IN3’ was modified with Al (1.8 wt.%). The thermal diffusivity and the specific heat capacity were measured using laser flash and differential scanning calorimetry, respectively. The thermal conductivity was calculated according to the results of the thermal diffusivity and specific heat capacity in the temperature range from room temperature to 800°C. The CTE was evaluated by push-rod dilatometer method. In this study, we present the thermophysical properties of the Inconel alloy 740, of which the base material was modified with titanium and aluminium.

Keywords: Inconel alloy 740; thermal diffusivity; specific heat capacity; thermal conductivity; CTE; coefficient of thermal expansion; DSC; differential scanning calorimeter; LFA; laser flash apparatus.

DOI: 10.1504/IJNT.2019.104472

International Journal of Nanotechnology, 2019 Vol.16 No.4/5, pp.273 - 280

Published online: 03 Jan 2020 *

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